CVE-2023-1732: Improper random reading in CIRCL
First published: Wed May 10 2023(Updated: )
### Impact When sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, did not check whether `crypto/rand.Read()` returns an error. In rare deployment cases (error thrown by the `Read()` function), this could lead to a predictable shared secret. The tkn20 and blindrsa components did not check whether enough randomness was returned from the user provided randomness source. Typically the user provides `crypto/rand.Reader`, which in the vast majority of cases will always return the right number random bytes. In the cases where it does not, or the user provides a source that does not, the blinding for blindrsa is weak and integrity of the plaintext is not ensured in tkn20. ### Patches The fix was introduced in CIRCL v. 1.3.3
Credit: cna@cloudflare.com cna@cloudflare.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cloudflare Circl | <1.3.3 | |
| go/github.com/cloudflare/circl | <1.3.3 | 1.3.3 |
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Reference Links
- https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x
- https://nvd.nist.gov/vuln/detail/CVE-2023-1732
- https://github.com/cloudflare/circl/commit/ff8d91225f8954b4970b6d6382d2e4c78f4a4cf8
- https://github.com/cloudflare/circl/releases/tag/v1.3.3
- https://github.com/advisories/GHSA-2q89-485c-9j2x (Advisory)
Frequently Asked Questions
What is the vulnerability ID of this issue?
The vulnerability ID is CVE-2023-1732.
What is the severity rating of CVE-2023-1732?
The severity rating of CVE-2023-1732 is 8.2 (High).
Which software is affected by CVE-2023-1732?
The Cloudflare Circl software version up to 1.3.3 is affected by CVE-2023-1732.
What is the impact of CVE-2023-1732?
This vulnerability could lead to a predictable shared secret in rare deployment cases.
Where can I find more information about CVE-2023-1732?
More information about CVE-2023-1732 can be found at the following link: https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x
- collector/nvd-index
- collector/github-advisory-latest
- alias/GHSA-2q89-485c-9j2x
- alias/CVE-2023-1732
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- canonical/cloudflare circl
- package-manager/go